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x/4+x/6+x/8=x-2(*2)
x-1-y+2=7x+14
2x+3x+4x=2x-4
x-y-7x=1-2+14
2x+3x+4x-2x=-4
6x-y=13
7x=-4
Coś źle :P ale możesz się tym sposobem kierować.